Improvement in clamps foe forming sheet-metal cones



FREDERICK I. SEYMOUR, OF WOLCOT'IVILLE, CONNECTICUT;

Letters Patent No. 75,803, dated Zlmt-t 10, 1868.

IMPROVEMENT IN CLAMPS FOR FORMING SHEET-METAL CONBS.

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TO ALL WHOM IT MAY CONGERN:

Be it known that I, FREDERIK I. SEYMOUR, of Wolcottville, in the countyof Litchfield, and State of Connecticut, have invented, made, andapplied to use a certain new and useful Improvement in Clamps forForming Sheet-Metal Cones; and I do hereby declare the following to be afull, clear, and exact description of the said invention, referencebeing had to the annexed drawing, making part of this specification,wherein- Figure 1 is a longitudinal section of the said clamp at theline a: 2;, and

Figure 2 is an end view of the clamp, with the part at the line 1j yremoved.

Similar marks of reference denote thesame parts.

Sheet-metal cones for lamp-chimney caps and other articles often requirea head to be rolled or form'ed in the metal. This is very diicult toeffect, particularly where they are lapped but not soldered or united atthe seam. i

My invention relates to a clamp for holding the sheet-metal cone in theproper position while the bead or rib is being formed thereon, and saidclamp becomes the guide for the tools that form such head or rib, sothat tho same is bent in the `sheet metal with great accuracy.

In the drawing, a is a conc of metal of the shape ofthe sheet-metal coneto be formed, but shorter, so that, when said cone a is placed insidethe sheet-metal conc b, the base of that cone, will project the amountnecessary for receiving the rib or bead. v

The conical outer case e is of a size and shape to t the exterior ofthesheet-metal cone 6, about the samo distance down it as the cone a; andut the end ofthe cone b are inclines, z'z', over which are turnedflanges, o o,

that project from the small end or neck of the cone a, so that the concsa and c can be firmly held together, to

clamp the sheet-metal cone b, by giving the cone'a a partial rotation,to bring the anges o o over the inclines A loose sleeve, c, is provided,surrounding the cone c, which the workman grasps as he presents thesheetmetal cone to the action of the tools that revolve and roll or formup the rib or bead in the sheet metal, the sleeve e allowing the conesa, Zz, and c to revolve freely during said operation.

l What I claim as my invention, and desire to secure hy Letters Patent,is-

1. The clamp for sheet-metal cones, formed of the conesa and c lockedtogether, as and for the purposes set forth. l

2. And, in combination therewith, I claim the sleeve e, surrounding thecone c, substantially'as and for the purposes set forth.

In witness whereof, I have hereunto set my signature, this 23d day ofJanuary, A` D. 1867.

FREDK I SEYMOUR.

Witnesses:

CHAs. H. SMITH, GEO. T. PINcKNEy.

